His clothes are so dirty that he shakes them out every now and then and sells topsoil.
他的衣服那么脏，每隔一阵子他抖搂抖搂就能卖肥土了。

A chisel plow, meanwhile, only fractures the topsoil and preserves more surface residue.
用凿犁耕田则只会松开表土, 保留较多的作物残株。

Erosion, the wearing away of topsoil by wind and rain, also contributes to water pollution.
侵蚀，服装以外的表土被风和雨，也有助于水污染。

When digging a hole for planting, one should put topsoil and subsoil in two different sides of the hole.
挖栽植坑时，应将表土和底土分别放在坑的两侧。

Loess is easy borne by the wind and may be carried long distances before it falls to earth and becomes topsoil.
黄土易被风刮起并带至远处方才落下成为表土层。

Experimental Investigation and Numerical Modeling for Removal of Chloropicrin from Topsoil by Soil Vapor Extraction
土柱通风法去除表层土中氯化苦的模拟实验研究

Compared with dripping and seeping irrigation, evaporation loss of water from topsoil is the most in furrow irrigation.
沟灌耕层土壤蒸发损失的水分大于滴灌大于渗灌。

Actual Measure and Numerical Simulated Forecast Analysis of Dangerous Position Freeze Temperature Field of Deep Topsoil Layer
深厚表土层危险层位冻结温度场实测与数值模拟预测分析